how to remove the Mst: Wishlist Prime app setup

1. Disable the App Embed

From your first screenshot:

1. Open Online Store → Themes → Customize
2. Click App embeds (icon marked as #1)
3. Find Wishlist 2.0 New Setup – Mst: Wishlist Prime
4. Turn the toggle OFF (marked as #2)
5. Click Save (marked as #3)

This disables the wishlist widget and app embed for the theme.

2. Remove Wishlist App Blocks

From your second screenshot:

1. In the theme editor, open the Product template.
2. Find the block named "Add To Wishlist: Product" (marked as #3).
3. Click the block.
4. Click Remove block at the bottom of the block settings panel.
5. Repeat for any other Wishlist blocks on product, collection, cart, or page templates.
6. Click Save (marked as #4).
7. 
   

Shopify app functionality can be added as app blocks, which can be removed directly from the theme editor.